How to Calculate the Capacity of a Loader's Bucket
There is more to estimating the capacity of a loader bucket than simply multiplying the bucket's crosssection by its width, since the material you are loading can lie in a heap that rises above the bucket.
The Society of Automotive Engineers has defined two different angles of repose for the purpose of comparatively rating buckets. If you do not know the actual angle of repose you will be using, estimate using 2:1 for wheel loader buckets and 1:1 for hydraulic excavator buckets.
Things You Will Need
 Large sheet of paper or cardboard
 Pencil
 Straightedge
Tip
The heap is actually 3dimensional, but this estimate assumes it is 2dimensional. The actual capacity will be slightly (about 2 percent) smaller than the estimate. To convert cubic feet into cubic yards, divide by 9.

Trace the outline of the bucket's interior crosssection on a large piece of cardboard.

Draw a straight base line to connect the open ends of the cross section. At the base line's midpoint, draw a perpendicular line to construct the heap area. For a 2:1 heap, make the perpendicular line a quarter of the length of the base line. For a 1:1 heap, make it a half of the base line's length.

Draw straight lines connecting the ends of the base line with the end of the perpendicular line to indicate how much additional area the cross section of the heap will have.

Draw a grid over your representation of the crosssection. For ease of estimation, make the grid squares 1 foot square for a larger bucket or, if extra precision is needed in a smaller bucket, 6 inches to a side such that each square represents a quarter of a square foot.

Count the number of squares that the cross section takes up to estimate the heap's cross sectional area. Combine parts of squares and count them as one square. Multiply the area you find with the width of the bucket to find the total capacity.
The Drip Cap
 There is more to estimating the capacity of a loader bucket than simply multiplying the bucket's crosssection by its width, since the material you are loading can lie in a heap that rises above the bucket.
 At the base line's midpoint, draw a perpendicular line to construct the heap area.
References
Writer Bio
Benjamin Twist has worked as a writer, editor and consultant since 2007. He writes fiction and nonfiction for online and print publications, as well as offering oneonone writing consultations and tutoring. Twist holds a Master of Arts in Bible exposition from Columbia International University.
Photo Credits
 Joe Raedle/Getty Images News/Getty Images
 Joe Raedle/Getty Images News/Getty Images
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